package com.titaniume.java2;

import com.titaniume.java1.Person;
import org.junit.Test;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

/**
 * @program: JavaSenior
 * @description: 获取运行时类的方法结构
 * @author: renfei.huang
 * @create: 2021-10-30 10:55
 */
public class MethodTest {

    @Test
    public  void test1(){

        Class clazz = Person.class;

        //getMethods() : 获取当前运行时类及其所有父类中声明为public权限的方法
        Method[] methods = clazz.getMethods();
        for (Method m : methods) {
            System.out.println(m);
        }

        System.out.println("--------------");

        //getDeclaredMethods() : 获取当前运行时类中声明的所有方法（不包含父类中声明的方法）
        Method[] declaredMethods = clazz.getDeclaredMethods();
        for (Method m : declaredMethods) {

            System.out.println(m);
        }
    }


    /*
    * @Xnxx
    * 权限修饰符 返回值类型 方法名（参数类型1 参数类型2......） throws XxxException{}
    * */
    @Test
    public  void test2(){

        //1.获取方法声明的注解
        Class clazz = Person.class;
        Method[] declaredMethods = clazz.getDeclaredMethods();
        for (Method m : declaredMethods) {
            Annotation[] annotations = m.getAnnotations();
            for (Annotation a : annotations) {
                System.out.println(a);
            }


            //2.权限修饰符
            System.out.print(Modifier.toString(m.getModifiers()) +"\t");


            //3.返回值类型
            System.out.print(m.getReturnType().getName() +" \t");


            //4.方法名
            System.out.print(m.getName());
            System.out.print("(");

            //5.形参列表
            Class [] parameterTypes = m.getParameterTypes();
            if(!(parameterTypes == null && parameterTypes.length == 0)){
                for (int i = 0; i < parameterTypes.length ; i++) {
                    //最后一个不在拼接逗号
                    if(i == parameterTypes.length - 1){
                        System.out.print(parameterTypes[i].getName() +" args_" + i);
                        break;
                    }
                    System.out.print(parameterTypes[i].getName() +" args_" + i + "," );
                }
            }
            System.out.print(")");


            //6.抛出的异常
            Class[] exceptionTypes = m.getExceptionTypes();
            if(exceptionTypes.length > 0){
                System.out.print("throws  ");
                for (int i = 0; i < exceptionTypes.length; i++) {
                    if(i == exceptionTypes.length - 1){
                        System.out.print( exceptionTypes[i].getName());
                        break;
                    }
                    System.out.print( exceptionTypes[i].getName() +",");
                }
            }

            System.out.println();

        }



    }

}
